Upload full sources with release

.github/workflows/uploadFirrtlBinaries.yml

@@ -42,6 +42,17 @@ jobs:
         with:
           fetch-depth: 2
           submodules: "true"
+
+      # Package up sources for distribution, as the default source bundles from GitHub don't include LLVM. Only runs on the ubuntu-20.04 runner.
+      - name: Archive Sources
+        if: ${{ matrix.runner }} == ubuntu-20.04
+        run: tar czf --exclude-vcs circt-full-sources.tar.gz .
+      - name: Upload Source Archive
+        uses: AButler/[email protected]
+        if: ${{ matrix.runner }} == ubuntu-20.04 && startsWith(github.ref, 'refs/tags/')
+        with:
+          files: circt-full-sources-${{ matrix.runner }}.tar.gz
+          repo-token: ${{ secrets.GITHUB_TOKEN }}
 
       # We need unshallow CIRCT for later "git describe"
       - name: Unshallow CIRCT (but not LLVM)